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Transparent UserControls

Posted on 2006-11-08
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Last Modified: 2010-04-23
I need to build a transparent control that has a true transparent background. We are building our own designer to hold controls and it seems like a very daunting task to paint the control's backcolor based upon any number of controls that could be underneath it. Is there any way to make this work?
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Question by:PLavelle
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by:Kinger247
ID: 17897890
Are you asking form something more than just :

Control.BackColor = Color.Transparent

???
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by:PLavelle
ID: 17897917
A transparent UserControl. Setting its backcolor to transparent doesn't work.
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by:Kinger247
ID: 17898111
Seems to work for me ?

I just created a new project with a form and usercontrol. I set the backgound of the usercontrol to transparent.
added the usercontrol to the form and it was transparent ?
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Expert Comment

by:Sancler
ID: 17898302
For me, it is transparent so far as the FORM itself is concerned, but not with respect to any controls placed on the form that are behind the usercontrol.  In my test, I was able to get the "hidden" controls to show by using .SendToBack on the usercontrol.  I don't know if that would be sufficient for your purposes.

Roger
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by:Kinger247
ID: 17898351
Ok, I see what your doing now.
Your right a transparent control will not show whats actually underneath it.

why do you need this ?  are you moving controls in a designer ?
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by:Kinger247
ID: 17898359
The reason why I ask is that I've created similar projects recently and have had to use smoke and mirrors.
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by:PLavelle
ID: 17899039
Yes exactly, moving controls in a designer.
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Kinger247 earned 500 total points
ID: 17899079
And you want them invisible as you move them ?

If this is the case, what I've done is used gdi to draw around the control you would be moving, then hide the the control and only drag the line via gdi.
A bit like dragging a form in windows, when all your seeing is a box where the window should be.
Then make the control visible again at the new location onmouseup event.
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by:Kinger247
ID: 17921940
Hi, did this work for you ?
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